Free stock photo of academic, adult, awareness, boy photo, brown hair, business images, caucasian ethnicity, child photos, childhood, class, classroom, clean energy, color image, communication, community, concentration, conceptual, construction, desk, eco, eco awareness, eco friendly, ecology, education, educational environment, elementary age, elementary school, energy, environment, environmental conservation, environmental science, european, focused, front view, future, girl, glasses, green energy, group photo, growth, horizontal, idea, indoor, innovation, learning, man, model, modeling, modelling, nature, person, photography, planet, pupil, recycling, renewable energy, research, school, science, science education, scientific model, selective focus, smart, social issue, student, study, studying, sustainability, sustainable, sustainable solutions, table, teacher pictures, teaching, teaching aid, teamwork, technology, teenage, teenager, training, wind, wind turbine, windmill, woman, youth